+ int arg = 0;
+ ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
+}
+
+/* it is recommended to call vout_fbdev_clear() before this */
+void *vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp,
+ int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
+{
+ int w_total = left_border + w + right_border;
+ int h_total = top_border + h + bottom_border;
+ size_t mem_size;
+ int ret;
+
+ // unblank to be sure the mode is really accepted
+ ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
+
+ if (fbdev->fbvar_new.bits_per_pixel != bpp ||
+ fbdev->fbvar_new.xres != w ||
+ fbdev->fbvar_new.yres != h ||
+ fbdev->fbvar_new.xres_virtual != w_total||
+ fbdev->fbvar_new.yres_virtual < h_total ||
+ fbdev->fbvar_new.xoffset != left_border ||
+ fbdev->buffer_count != buffer_cnt)
+ {
+ if (fbdev->fbvar_new.bits_per_pixel != bpp ||
+ w != fbdev->fbvar_new.xres || h != fbdev->fbvar_new.yres)
+ printf(" switching to %dx%d@%d\n", w, h, bpp);
+
+ fbdev->fbvar_new.xres = w;
+ fbdev->fbvar_new.yres = h;
+ fbdev->fbvar_new.xres_virtual = w_total;
+ fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
+ fbdev->fbvar_new.xoffset = left_border;
+ fbdev->fbvar_new.yoffset = top_border;
+ fbdev->fbvar_new.bits_per_pixel = bpp;
+ fbdev->buffer_count = buffer_cnt;
+ fbdev->buffer_write = 1;
+
+ // seems to help a bit to avoid glitches
+ vout_fbdev_wait_vsync(fbdev);
+
+ ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
+ if (ret == -1) {
+ // retry with no multibuffering
+ fbdev->fbvar_new.yres_virtual = h_total;
+ ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
+ if (ret == -1) {
+ perror("FBIOPUT_VSCREENINFO ioctl");
+ return NULL;
+ }
+ fbdev->buffer_count = 1;
+ fbdev->buffer_write = 0;
+ fprintf(stderr, "Warning: failed to increase virtual resolution, "
+ "multibuffering disabled\n");
+ }